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Brian Knarr, PhD, et al.

Lack of physical activity has serious health and
functional consequences for people after a stroke.
Therefore, interventions to improve activity after a
stroke and accurate methods to measure activity are
needed. This study examined how the length of the
interval over which activity data are sampled affects
the measurement of activity. The results showed that
the length of the sampling interval can result in either
overestimating or underestimating activity. Such
overestimation and underestimation is worse when
activity is low, which could affect the interpretation
of comparisons between groups of people with very
different activity amounts.http://dx.doi.org/10.1682/JRRD.2012.12.0225